Strain engineering of ferromagnetic-graphene-ferroelectric nanostructures
| Autor: | Maksym V. Strikha, Anna N. Morozovska, Eugene A. Eliseev |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Materials science
Landauer formula FOS: Physical sciences General Physics and Astronomy Physics::Optics 02 engineering and technology 01 natural sciences law.invention symbols.namesake Condensed Matter::Materials Science law Mesoscale and Nanoscale Physics (cond-mat.mes-hall) 0103 physical sciences Phenomenological model 010306 general physics Condensed Matter - Materials Science Condensed matter physics Condensed Matter - Mesoscale and Nanoscale Physics Graphene Fermi level Materials Science (cond-mat.mtrl-sci) Conductance 021001 nanoscience & nanotechnology Ferroelectricity Polarization density Ferromagnetism symbols Condensed Matter::Strongly Correlated Electrons 0210 nano-technology |
| Zdroj: | Physical Review Applied |
| Popis: | We calculated a spin-polarized conductance in the almost unexplored nanostructure "high temperature ferromagnetic insulator/ graphene/ ferroelectric film" with a special attention to the impact of electric polarization rotation in a strained multiaxial ferroelectric film. The rotation and value of polarization vector are controlled by a misfit strain. We proposed a phenomenological model, which takes into account the shift of the Dirac point due to the proximity of ferromagnetic insulator and uses the Landauer formula for the conductivity of the graphene channel. We derived analytical expressions, which show that the strain-dependent ferroelectric polarization governs the concentration of two-dimensional charge carriers and Fermi level in graphene in a self-consistent way. We demonstrate the realistic opportunity to control the spin-polarized conductance of graphene by a misfit strain ("strain engineering") at room and higher temperatures in the nanostructures CoFeO4/graphene/PZT and Y3Fe5O12/graphene/PZT. Obtained results open the possibilities for the applications of ferromagnetic/graphene/ferroelectric nanostructures as non-volatile spin filters and spin valves. 21 pages, including 5 figures and a supplement at 5 pages with 1 figure |
| Databáze: | OpenAIRE |
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